Garrison Keillor/ Star Tribune photo

Garrison Keillor announced Thursday that he'll be having a medical procedure on Sept. 25 that will force him to cancel a Sept. 27 edition of "A Prairie Home Companion."

Keillor, 72, wasn't specific about the operation, but did say this in a statement:

"I now know more about the prostate than I ever wanted to," he said. "If you've noticed my upstairs bathroom light go on at 10 p.m., 10:10, 10:25, 10:40, etc., you know all you need to know. It's no way to live, so I've found an excellent surgeon who will fix everything, and by October, I will be thinking more about truth and beauty and less about plumbing."

The Sept. 20 season kick-off and street dance will go on as scheduled, as will a tour that includes stops in Minneapolis, Duluth and Rochester.